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(CNN) -- For six months now, the days have grown shorter and the nights have grown longer in the Northern Hemisphere -- but that's about to reverse itself.Winter solstice, the shortest day of 2019, will be Saturday, December 21. Or it will be Sunday, December 22. Which day is it for you? It all depends on your time zone.CNN meteorologists Dave Hennen, Judson Jones and Brandon Miller help us understand the science and timing behind the solstice. And then we'll discover some traditions and celebrations around the world that could inspire a travel adventure.The science and timing behind a winter solsticeThe winter solstice marks the shortest day of the year in the Northern Hemisphere, when the sun appears at its most southerly position, directly overhead at the faraway Tropic of Capricorn.It's the reverse in the Southern Hemisphere. There, it marks the longest day of the year -- and the beginning of summer in places such as Argentina, Namibia and New Zealand.When exactly does it occur?The solstice usually takes place on December 21. The time that the solstice occurs and the day itself shifts because the solar year (the time it takes for the sun to reappear in the same spot as seen from Earth) doesn't exactly match up to our calendar year.If you want to be super-precise in your observations, the exact time of the 2019 winter solstice will be 4:19 Universal Time on Sunday. Here are some examples of when that will be for local times around the world:-- Tokyo: 1:19 p.m. Sunday-- Dubai: 8:19 a.m. Sunday-- Rome: 5:19 a.m. Sunday-- Dakar, Senegal: 4:19 a.m. (same as Universal Time)-- Philadelphia: 11:19 p.m. Saturday-- Seattle: 8:19 p.m. Saturday-- Honolulu: 6:15 p.m. SaturdayIf you don't live in one of these time zones above, the website EarthSky has a handy conversion table for your time zone. You might also try the conversion tools at Timezoneconverter.com or WorldTimeServer.com.What causes the winter solstice to even happen?Because the Earth is tilted on its rotational axis, we experience seasons here on Earth. As the Earth moves around the sun, each hemisphere experiences winter when it's tilted away from the sun and summer when it's tilted toward the sun.Wait. Why is the Earth tilted?Scientists are not entirely sure how this occurred, but they think that billions of years ago, as the solar system was taking shape, the Earth was subject to violent collisions that caused the axis to tilt.What other seasonal transitions do we mark?The equinoxes, both spring and fall, occur when the sun's rays are directly over the equator. On those two days, everyone has an equal length of day and night. The summer solstice is when the sun's rays are farthest north over the Tropic of Cancer, giving us our longest day and summer in the Northern Hemisphere.Winter solstice traditions and celebrationsIt's no surprise many cultures and religions celebrate a holiday -- whether it be Christmas, Hanukkah, Kwanzaa or pagan festivals -- that coincides with the return of longer days.Ancient peoples whose survival depended on a precise knowledge of seasonal cycles marked this first day of winter with elaborate ceremonies and celebrations. Spiritually, these celebrations symbolize the opportunity for renewal, a shedding of bad habits and negative feelings and an embracing of hope amid darkness as the days once again begin to grow longer.Many of the ancient symbols and ceremonies of the winter solstice live on today.Here are five extraordinary destinations where you can experience something magical during winter's relentlessly long night:UNITED KINGDOM: Cornwall and StonehengeBetter known for pirates than the solstice, the town of Penzance on the southwest coast of England has revived a delightful array of Cornish solstice events leading up to winter solstice. The Montol Festival is a fun mix of pagan customs and more recent Christmas traditions that were once common throughout Cornwall.Early in the week, join in caroling and other events. On the solstice, referred to here as Montol Eve, get your dancing card ready for the Guise, a community dance in which people dress in masks and other "topsy-turvy" disguises based on a 19th-century tradition of the rich dressing in rags while poorer citizens effected a "mock posh" look.You can also don your finery for torchlit processions. The merrymaking only continues when the revelers disperse to pubs around town.With some planning, it's also possible to incorporate a trip to Stonehenge, the UK's most famous site for solstice celebrations. On the winter solstice, visitors have the rare opportunity to enter the towering, mysterious stone circle for a sunrise ceremony run by local pagan and druid groups.The trip from Penzance to Stonehenge takes less than four hours by car, making it entirely feasible to spend the night in Salisbury, the nearest town to Stonehenge, and rise before dawn for the ceremony among the stones.SWEDEN: Santa Lucia, yule and aurora borealisSweden is rich with solstice traditions. Elements of the yule, Northern Europe's a

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With temperatures hitting record lows across the country, it's important to make sure you and your pets are safe. There are a few things you should know to make sure your 183

YPSILANTI, Mich. — One entrepreneur thinks flying cars will one day change the way Americans travel — even though his creation almost cost him his life.Sanjay Dhall, the founder of Detroit Flying Car Company, is still recovering from a December crash at Willow Run Airport in Ypsilanti. Dhall said he was testing out the controls in his flying car prototype when he accidentally took off and found himself 150 feet in the air.“It was a miraculous escape. I did break a lot of bones from head to toe,” Dhall said. “… But amazingly the machine took the majority of the impact and I survived.”The machine was destroyed.“One wrong calculation can mean the difference between life and death,” Dhall said. He says he now is more committed than ever to getting the technology right.“I still want to get back and build another prototype, a demonstrator vehicle that will succeed,” Dhall said.A study released this week by the University of Michigan motivates him. It found that for trips of about 60 miles and longer, a fully-loaded flying car carrying a pilot and three passengers had 52% lower greenhouse gas emissions and time savings compared to ground-based gasoline powered cars with an average vehicle occupancy of 1.54."Consumers could be incentivized to share trips, given the significant time savings from flying versus driving," The study's author, Akshat Kasliwal, said.The study found flying cars would travel the 60 miles much faster, resulting in a time savings of about 80 percent compared to cars driving on the road.When compared to electric cars, fully-loaded flying cars still had 6% lower greenhouse gas emissions on trips longer than 60 miles.“When flight happens, constraints are gone. And when constraints go away things have a way of going cleaner ways,” Dhall said.The study did find that on short trips, it is more efficient to stay on the ground.Dhall points out that his prototype features wings that retract into the vehicle, allowing travel by road or sky. In theory, he says it could be an overall greener way of traveling.He says he named his company in honor of the Detroit inventors who changed the way people around the world travel.He believes flying cars will do the same in the future. 2229

EL CAJON, Calif. (KGTV) - Tyson Kirkpatrick's family is one of the first to own a home in Main Ranch - a planned development on the northeast end of El Cajon.They bought their brand new single-family home for a price in the low 500-thousands. That was about 0,000 less than the similar properties they were looking for over at Santee Lakes. "It was more of our price point," Kirkpatrick said. "It makes me feel great. It makes me feel very fortunate to be here."Main Ranch will ultimately grow to more than 130 new homes.Complete Coverage: Life in El CajonIn the last two years, El Cajon has seen as many as 850 new housing units get built. Prices for single family homes in the city are as much as 20 percent below the median for the county, which CoreLogic says was 0,000 in October. "We made a calculated decision that we wanted to be more competitive in this market," said El Cajon Mayor Bill Wells.Wells said the city has taken three key steps to attract builders. First, it eliminated developer impact fees which pay for important infrastructure related to the growth. The City of San Diego, for instance, charges as much as ,000 per unit. In El Cajon, the city instead relies on its general fund, boosted by a half-cent sales tax that expires in 2029, an issue now being studied at City Hall. Last April, the City Council hired a consulting firm to explore adding fees to developments, but Wells said he does not expect that to happen or any financial headwinds. "We're careful about how we spend our money, and we make sure we have to have enough money to take care of it," said Wells.The city also changed its zoning to allow developers who meet certain requirements to build without a public hearing. That reduces chances for opposition and costly delay.Finally, El Cajon has taken a more customer-service approach to interacting with developers whether for permitting at city hall or inspections on site. "In the City of El Cajon, it's tough but fair, and they give you a chance to alleviate some of their concerns on the spot," said Dan Scott, the construction superintendent at Main Ranch. In all, Wells says El Cajon is a great place to raise a family. He says adding housing that's affordable is a key way the city can encourage people to come see that for themselves. 2302

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